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Pontiac
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1972
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Firebird Base, 7.5L Eng VIN T, Not Available Trans
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Repair and Diagnosis
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Heating, Ventilation & A/C (HVAC)
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HVAC Control Systems
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Automatic Temperature Control
Automatic Temperature Control
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Description
Notes
Instrument Panel Control Head
Sensor System & Temperature Dial Rheostat
Notes
In-Car Sensor
Ambient Sensor
Feedback Potentiometer
Programmer
Notes
Amplifier
Transducer
Vacuum Motor
Vacuum Checking Relay
Feedback Potentiometer
Other Control Units
Engine Thermal Switch
In-Car Temperature Switch
Ambient Switch
Lo Relay
Auto Relay
Hi Relay
Operation
Notes
Temperature Dial (Thumbwheel)
Control Head Selector Lever
Notes
Off
Vent
Lo
Auto
Hi
BILEVEL
Defrost
Adjustment
Notes
Temperature Door Link
B Series
Temperature Dial Calibration
Feedback Potentiometer (Programmer Amplifier) Calibration
New Feature Note
Testing
Functional Test
ATC Tester
Notes
Testing Procedure